|Publication number||US5350022 A|
|Application number||US 07/918,662|
|Publication date||Sep 27, 1994|
|Filing date||Jul 22, 1992|
|Priority date||Jul 22, 1992|
|Publication number||07918662, 918662, US 5350022 A, US 5350022A, US-A-5350022, US5350022 A, US5350022A|
|Inventors||Richard L. Launder, Charles Clendenning|
|Original Assignee||H & L Tooth Company|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (9), Referenced by (38), Classifications (6), Legal Events (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to an attachment assembly for the connection of ripper teeth to wheel or track-type tractors with ripper attachments. More particularly, the invention comprises a novel protective wear cap and ripper shank for reducing the drag of the ripper shank through the ground during use and protecting the shank from wear.
In soil excavation, it is common practice to loosen the soil so that it can be more easily loaded onto a skip loader or carry-all for removal. This is typically accomplished by dragging a plurality of ripper teeth through the soil by means of a wheel or track-type tractor. The tractor is provided with a hydraulically actuated box to which the ripper teeth are secured by means of a corresponding plurality of substantially "J"-shaped adaptors commonly known as ripper shanks. The individual ripper teeth are secured to the lower forward ends of the shanks by means of flex or roll pins. The shanks are in turn secured to the box on the tractor by a wedge key or suitable locking pin. While such a configuration is widely used, it has been found to have certain drawbacks. The forward surface of the ripper shanks, which is flat, creates additional drag for the tractor and is subjected to substantial wear during use, particularly in the area of the shank proximate to the tooth which is dragged through the ground with the tooth. As the shank wears, it becomes susceptible to breakage, requiring replacement.
Because of the costs associated with replacing the larger ripper shanks, wear caps have been developed in an effort to protect the lower portion of the shanks proximate the ripper teeth. These wear caps are generally "U"-shaped in cross section so as to cover the front surfaces of the shanks and they extend about the sides of the ripper shanks where they are secured to the shanks. This configuration results in a widening of the shank which further inhibits their ability to pass through the ground. In addition, the attachment members which hold these wear caps in place are typically secured to the ripper shanks by means of a locking pin which passes through the upper portions of the shanks proximate the ripper box. As this portion of the ripper shank experiences the greatest stress during use, these mounting holes create stress points which have lead to fracturing of the shanks.
It would be highly desirable to provide a wear cap for ripper shanks which reduce the wear on the shanks without increasing the drag of the shanks through the ground and without weakening the shanks. It would also be highly desirable to provide such a protective wear cap which cooperates with the ripper tooth so as to reduce the drag normally associated with unprotected conventional shanks. The ripper shank and wear cap configurations of the present invention achieve these results.
Briefly, the present invention comprises a substantially "J"-shaped ripper shank adapted to be secured to a conventional ripper box and carry a ripper tooth at the lower forward end thereof, and an elongated wear cap carried by the forward edge of the shank proximate the tooth and having a transversed dimension substantially equal to the width of the ripper shank. The forward edge of the shank defines a continuous curvilinear transversed rib adapted to be received in a corresponding configured channel in the rear portion of the wear cap such that upon the wear cap being transversely slided over the rib, the sides of the wear cap are substantially flush with the sides of the ripper shank and the wear cap is held against the forward wall surface of the shank. To prevent lateral movement of the wear cap with respect to the shank, the lower end of the wear cap is secured adjacent a lower portion of the shank within the tapered cavity in the rearward portion of the ripper tooth. The upper end of the wear cap is restrained against lateral movement by a generally "U"-shaped securement bracket which is carried by the wear cap and extends about lateral portions of the side of the ripper shank. The forward facing surface of the wear cap is tapered to cooperate with a corresponding taper in the upper surface of the ripper tooth to facilitate movement of the tooth and shank through the ground during use.
It is the principal object of the present invention to provide an improved assembly for the mounting of ripper teeth on earth excavation equipment.
It is another object of the present invention to provide a mounting assembly for ripper teeth which reduces the wear on the tooth carrying ripper shanks during use.
It is yet another object of the present invention to provide a mounting assembly for ripper teeth which reduces the drag of the ripper shanks to which the teeth are secured as the shank is pulled through the ground during use.
It is still a further object of the present invention to provide a mounting assembly for ripper teeth which reduces the wear on the tooth carrying shanks during use without weakening the shanks.
It still a further object of the present invention to provide an improved protective wear cap for ripper shanks which is of simple construction and economical to manufacture.
These and other objects and advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
FIG. 1 is a partial side view of the attachment assembly of the present invention.
FIG. 2 is a sectional view taken along the line 2--2 of FIG. 1.
FIG. 3 is a perspective view of the ripper shank of the present invention.
FIG. 4 is a perspective view of the wear cap of the present invention.
FIG. 5 is a perspective view of a ripper tooth used in the present invention.
FIG. 6 is a sectional view taken along the line 6--6 of FIG. 1.
Referring now in detail to the drawings, the assembly of the present invention comprises a ripper tooth 10, a substantially flat ripper shank 12, an elongated wear cap 14 and a securement member 16. The ripper shank 12 is constructed of alloy steel and can be of a cast, fabricated or forged construction. Ripper shank 12 is substantially "J"-shaped and defines a lower forwardly projecting end portion 18 which carries the ripper tooth 10, an upper end portion 20 which is secured in a conventional manner by a wedge key or pin to the ripper box (not shown), a forwardly facing end surface 22 and parallel sides 24. An aperture 25 is provided in the upper end portion 20 of the shank for such securement and a standard lifting eye 27 can be provided at the upper end of the shank. The forward end surface 22 of shank 12 defines a continuously curvilinear securement rib 26 integrally formed therewith and projecting therefrom proximate the lower end portion 18 of the shank for carrying the elongated wear cap 14.
The securement rib 26 on shank 12 extends laterally across the forward end surface 22 of the shank and defines a lower concave surface 28 which merges into surface 22 and into a lower convex surface 30. Surface 30 merges into an arcuate spanning portion 32 which in turn merges into an upper convex surface 34. Surface 34 merges into an upper concave surface terminating in the forward surface 22 of the ripper shank 12, thereby defining a pair of curvilinear undercut portions 33 and 35 adjacent the upper and lower ends of the rib 26. An aperture 36 extends transversely through the ripper shank 12 in the lower end portion 18 thereof which is adapted to receive a roll or a flex pin 38 for the securement thereto of tooth 10.
The protective wear cap 14 is also constructed of alloy steel, is of the same transverse dimension as the ripper shank 12 and defines a tapered front surface 40, a rearwardly offset lower curvilinear portion 42 terminating in an end 44 adjacent the lower end portion 18 of the ripper shank, and a rear surface 46. Rear surface 46 defines a lower curvilinear portion 48, an upper portion 50, an open ended transversed slot 52 in portion 50, and an open ended channel 54 disposed between portions 48 and 50. Channel 54 is defined by the rear surface 46 of the wear cap and shaped so as to receive the securement rib 26 therein upon the wear cap 14 being slided transversely thereover. As seen in FIG. 1, upon sliding the wear cap 14 over rib 26 such that the rib is received within channel 54, the curvilinear rear surface 46 of wear cap 14 is disposed continually adjacent the forward end surfaces defined by the shank 12 and is held there by the mating configurations of the securement rib 26 and channel 54.
The ripper tooth 10 has substantially parallel side wall portions 60 which terminate in slightly tapered forward side portions 62 which taper more sharply at 64 to a point 65. The upper surface of the tooth defines a tapered digging rib 66 which flares outwardly at 67 and extends to the side wall portions adjacent the base 68 of the tooth 10. The tooth 10 also defines a tapered cavity 70 in the rear portion thereof, oppositely aligned apertures 72 in the side wall portions 60 communicating with cavity 70, and a beveled surface 74 in the upper portion of base 68 of the tooth at the entrance to cavity 70. As seen in FIG. 1, the lower end portion 18 of ripper shank 12 and the adjacently disposed lower end portion 44 of the wear cap 14 project into cavity 70 in the tooth in a mating fitment such that the aperture 36 in the end portion of the shank is aligned with apertures 72 in the base of the tooth. The roll or flex pin 38 projects through aligned apertures 36 and 70, securing the tooth to the shank and holding the forward lower end portion 44 of the wear cap 14 within cavity 70 to prevent relative lateral movement of the wear cap with respect to the shank and tooth. The apertures 70 in the tooth are preferably slightly elliptical or elongated to accommodate some rearward movement of the ripper tooth 10 relative to the shank 12 during use to avoid unduly stressing pin 38.
The upper portion of the wear cap 14 is restrained against a lateral movement with respect to the shank by means of securement member 16. Securement 16 is generally "U"-shaped and defines a tapered body portion 80 and parallel arm portions 82. Arm portions 82 are adapted to extend about the upper portion of the wear cap 14 and adjacent portions of the shank 12 and are provided with oppositely aligned apertures 84 therein. Upon disposing the body portion 80 of securement member 16 over the upper portions of the wear cap 14 and shank as seen in FIG. 1, the apertures 80 therein are aligned with the transversed slot 52 in the wear cap. By inserting a roll or flex pin or other suitable locking pin 81 through apertures 80 and slot 52, the securement member 16 is secured to the wear cap with the arm portions 82 of the securement member 16 preventing any relative lateral movement of the upper portion of the wear cap 14 with respect to the shank 12. If desired, and at the risk of weakening the shank, the arm portions 82 of securement member 16 could be extended such that the apertures 84 therein could be aligned with a transversed aperture in the shank so as to secure the securement member 16 to the shank 12 as opposed to the wear cap 14.
Through the aforesaid configuration, the wear cap 14 protects the forward end surface 22 of the ripper shank 12 without increasing the thickness of the shank in the area adjacent the ripper tooth and thereby avoids any increase in drag. In fact, the tapered front digging surface 40 of the wear cap 14 which is axially aligned with and angularly disposed with respect to the tapered flared digging rib 66 on the upper surface of the ripper tooth 10, cooperates with rib 66 to cut to through the ground more efficiently than ripper shanks carried by conventional unprotective ripper shanks. The aforesaid assembly also allows the wear cap and/or ripper tooth to be easily removed from the ripper shank for replacement when necessary.
Various changes and modifications may be made in carrying out the present invention without departing from the spirit and scope thereof. Insofar as these changes and modifications are within the purview of the appended claims, they are to be considered as part of present invention.
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|U.S. Classification||172/700, 172/772, 172/753|
|Oct 21, 1992||AS||Assignment|
Owner name: H&L TOOTH COMPANY, CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:LAUNDER, RICHARD L.;CLENDENNING, CHARLES;REEL/FRAME:006372/0198;SIGNING DATES FROM 19921008 TO 19921009
|Mar 5, 1998||FPAY||Fee payment|
Year of fee payment: 4
|Apr 16, 2002||REMI||Maintenance fee reminder mailed|
|Sep 27, 2002||LAPS||Lapse for failure to pay maintenance fees|
|Nov 26, 2002||FP||Expired due to failure to pay maintenance fee|
Effective date: 20020927